
| Nominal Size or Basic Screw Diameter | Head Diameter | Head Height | Head Chamfer | Hex Socket Size | Key Engagement | Wall Thickness | Edge of Head Chamfer | Length | ||
| Max | Min | Max | Min | Max | Nom | Min | Min | Max | Under Head | |
| No. 3 (0.0990) | 0.161 | 0.154 | 0.099 | 0.095 | 0.008 | 5/64 (0.078) | 0.044 | 0.034 | 0.007 | 3/8 |
| SEE NOTES 1 | 3 | 4 | 20 | 6 | 9, 10, 11 | |||||
Reprinted from ASME/ANSI B18.3 by permission of The American Society of Mechanical Engineers. All rights reserved. For a full copy of the standards, contact the ASME at http://www.asme.org/codes/.